To this logic Trutvetter also devoted himself, and in it he taught his pupils. He had just then published a series of treatises on the subject. To him this study was real earnest. Compared with others, he has shown in these excursions a cautious and discreet moderation, and no inclination for the quarrels and verbal combats often dear to logicians. The same can be said of his colleague Usingen. Trutvetter has shown also that he enjoyed and was widely read in earlier and modern, especially, of course, in Scholastic literature, including the works not only of the most important, but also of very obscure authors. We can imagine what delight he took in all this when in his professor's chair, and how much he expected from his pupils. At Erfurt meanwhile, and by this same philosophical facility, a fresh and vigorous impulse was being given to that study of classical antiquity, which gave birth to a new learning, and ushered in a new era of intellectual culture in Germany. We have already had occasion to refer to the movement and influence of Humanism at the schools which Luther attended at Magdeburg and Eisenach. He now found himself at one of the chief nurseries of these 'arts and letters' in Germany, nay, at the very place where their richest blossoms were unfolded. Erfurt could boast of having issued the first Greek book printed in Germany in Greek type, namely, a grammar, printed in Luther's first year at the University. It was the Greek and Latin poets, in particular, whose writings stirred the enthusiasm and emulation of the students. For refined expression and learned intercourse, the fluent and elegant Latin language was studied, as given in the works of classical writers. But far more important still was the free movement of thought, and the new world of ideas thus opened up.